The North Korean famine (Korean: 조선 기근), The Difficult March, or The Pain Anthem (고난 의 행군) was a period of mass starvation in North Korea from 1994 to 1998, with the general economic crisis. Famine has been caused by a variety of factors. Economic mismanagement and the loss of economic support as a result of the dissolution of the Soviet Union caused food production and imports to decline rapidly. A series of floods and droughts aggravated the crisis. The North Korean government and the centrally planned system were not enough to effectively mitigate the disaster. Death number estimates vary widely. Somewhere between 240,000 and 3,500,000 out of a total population of about 22 million, North Koreans died of starvation and starvation-related diseases, with deaths peaking in 1997. In a US Census Bureau report from 2011, the number of extreme deaths from 1993 to 2000 was between 500,000 and 600,000.